20198532402 has 24 divisors (see below), whose sum is σ = 44480923500. Its totient is φ = 6622469280.

The previous prime is 20198532401. The next prime is 20198532443. The reversal of 20198532402 is 20423589102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18098051841 + 2100480561 = 134529^2 + 45831^2 .

It is a super-2 number, since 2×20198532402² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20198532401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9196777 + ... + 9198972.

Almost surely, 2^20198532402 is an apocalyptic number.

20198532402 is an abundant number, since it is smaller than the sum of its proper divisors (24282391098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20198532402 is a wasteful number, since it uses less digits than its factorization.

20198532402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395818 (or 18395815 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20198532402 in words is "twenty billion, one hundred ninety-eight million, five hundred thirty-two thousand, four hundred two".